US2761919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-linear automatic contrast control circuit for video amplifier
Assignee: EMI Ltd
•
Filing: 1951-11-27
•
Granted: 1956-09-04
•
Expires: 1971-11-27
Abstract
No abstract record available.
Inventors
- 👤 Stillwell Peter Frederic Cryer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:37
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2190753A
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US2188068A
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US2222933A
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US2338412A
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GB542820A
Cited
US2295410A
Cited
US2509987A
Cited
US2519238A
Cited
US2552588A
Cited
US2583345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |